Q. No.The paired homologues seen during zygotene of meiosis I are known as:
1.
Bivalent
2.
Tetrad
3.
Mitotic apparatus
4.
Sister chromosomes
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Which of the following is not a feature of diakinesis stage of prophase I of meiosis I?
| 1. | Terminalization of chiasmata |
| 2. | Meiotic spindle assembling to prepare separation of homologues |
| 3. | Decondensation of the chromatin |
| 4. | NEBD and disappearance of nucleolus |
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What would be true for comparison of Anaphase I and Anaphase II of meiosis?
| 1. | Centromere does not split in Anaphase I and homologues separate but centromere splits in Anaphase II and sister chromatids separate. |
| 2. | Centromere splits in Anaphase I and homologues separate but centromere does not split in Anaphase II and sister chromatids separate. |
| 3. | Paired homologues get attached to spindle from opposite poles in Anaphase I while sister chromatids of individual chromosomes get attached to spindle from opposite poles in Anaphase II. |
| 4. | Paired homologues get attached to spindle from opposite poles in Anaphase II while sister chromatids of individual chromosomes get attached to spindle from opposite poles in Anaphase I. |
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In meiosis:
| 1. | A single round of DNA replication is followed by two sequential divisions with the chromosome number and DNA content getting reduced twice |
| 2. | A single round of DNA replication is followed by two sequential divisions with the chromosome number getting reduced twice and DNA content getting reduced once |
| 3. | A single round of DNA replication is followed by two sequential divisions with the chromosome number getting reduced once and DNA content getting reduced twice |
| 4. | A single round of DNA replication is followed by two sequential divisions with the chromosome number and DNA content getting reduced once |
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Meiosis results in the formation of:
1. Two genetically identical diploid cells
2. Two genetically non identical diploid cells
3. Four genetically identical haploid cells
4. Four genetically non identical haploid cells
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Crossing over or recombination can be defined as:
| 1. | exchange of segments between sister chromatids of homologous chromosomes |
| 2. | exchange of segments between non sister chromatids of homologous chromosomes |
| 3. | exchange of segments between sister chromatids of heterologous chromosomes |
| 4. | exchange of segments between non sister chromatids of heterologous chromosomes |
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The mechanisms that contribute to the genetic variation arising from sexual reproduction include:
| I: | Independent assortment of chromosomes |
| II: | Crossing over |
| III: | Random fertilization |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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Identify the stage of meiotic cell division shown in the given diagram:
| 1. | Anaphase I | 2. | Anaphase II |
| 3. | Telophase I | 4. | Telophase II |
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The beginning of diplotene is recognized by:
| I: | dissolution of the synaptonemal complex |
| II: | the tendency of recombined homologues of bivalents to separate |
| III: | tetrads becoming clearly visible |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, and III |
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Meiosis results in
1. Production of gametes
2. Reduction in the number of chromosomes
3. Introduction of variation
4. All of the above
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